The possible need for pre-screening cargo prior to its being embarked to the United States may lead to a division of airports and seaports into those that can provide this service and those that cannot. For trade destined for the United States, this may lead to an increase of concentration of cargo in transhipment hubs which are capable of providing the required controls. As the majority of countries will be less likely to be able to host such hub ports, their exports will also be more likely to encounter the need to be transhipped in other countries' ports.
El movimiento internacional de carga y buques implica un número potencialmente muy grande de controles e inspecciones (véase también la sección B del capítulo III sobre las preocupaciones en materia de seguridad), y en la medida en que dichos controles requieran mucho tiempo o de que su duración varíe arbitrariamente, esto se convertirá en un obstáculo para la planificación y el funcionamiento de los servicios.